题解 | #句子逆序#

import java.util.Scanner;
public class Main{
    public static void main(String []args){
        Scanner in = new Scanner(System.in);
        String str = new String(in.nextLine());
        if(1 <= str.length() && str.length() <= 1000){
            int end = str.length() - 1;
            int start = 0;
            for(int i = str.length() - 1; i >= 0; i--){
                if(str.charAt(i) == " ".charAt(0) || i == 0){
                    if(i == 0){
                        /*for(int j = i; j <= end; j++){
                        System.out.print(str.charAt(j));
                        }*/
                        System.out.print(str.substring(i, end + 1));
                        break;
                    }
                    else{
                        //旧方法，效率较低，其实不用循坏，直接调用substring()即可
                        /*for(int j = i + 1; j <= end; j++){
                        System.out.print(str.charAt(j));
                        }*/
                        System.out.print(str.substring(i + 1, end + 1));
                        end = i - 1;
                        System.out.print(" ");
                    }
                }
            }
        }
    }
}